The Domain Name System (DNS) has a tree structure or hierarchy, with each non-RR (resource record) node on the tree being a domain name. A subdomain is a domain that is part of a larger domain; the only domain that is not also a subdomain is the root domain.

For example, is a subdomain of, is a subdomain of However while is a subdomain of it is not a subdomain of

WebCopy includes support for automatically including sub or sibling domains as required. It also has a shortcut "Copy All Resources" option which allows linked resources (e.g. non-HTML) to be downloaded regardless of location.


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